Paper-pulp-finishing engine



(No Model.) I 2 Sheets-Sheet 1. S. L. GOULD.

PAPER PULP FINISHING ENGINE. No. 337,489. Patented Mar. 9, 1886.

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PAPER PULP FINISHING ENGINE. r N0.337,489. Patented Mar. 9, 1886.

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PATEN SIMEON LATHAM GOULD, OF GARDINER, MAINE, ASSIGNOR OF ONE-HALF TO\VILLIAM A. RUSSELL, OF LAWRENCE, MASSACHUSETTS.

PAPER-PULP-FINISHING ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 337,489, dated March9, 1886.

Application filed November 12, 1885. Serial No.182,526. (No model.)

To all whom it may concern:

Beit known that I, SIMEoN LATHAM GOULD, a citizen ol'the United States,residing at Gardiner, in the county of Kennebec and State of Maine, haveinvented certain new and useful Improvements in Paper-Pulp-FinishingEngines; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompa nying drawings, and to letters or figures ofreference marked thereon, which form a part of this specification.

This invention relates to paper-pulp engines, and belongs especially tothat class termed finishing-engines, since they receive the ground ragsor other fibrous material from the beating-engines and reduce it morethoroughly and evenly, and thereby render the entire mass of moreuniform consistency preparatory to its being run into the stuff-chest,

. whence it is delivered upon or to the papermaking machine.

In this particular class of engines rapidity of feed is of the utmostimportance; hence there should be a very large area of heatingsurfacecombined with means for easily discharging the pulpy mass passingthrough.

My invention contains several important features, prominent among thembeing primarily the method of feeding the engine centrally, orthereabout, and discharging the beaten stock peripherally of the same.Thus the centrifugal force is rendered an active agent in acceleratingthe free flow of the material through the machine, and there are nocounter-currents to oppose the discharge.

Secondly. In the arrangement of the rotary grinding-disk, by which thefeed is permitted .to enter upon both sides, in order to obviate the endthrusts or shrugs arising from having thefeed enter only upon one side;hence I am enabled to balance the grinding-disk. Hitherto thisend-thrust has been a very serious objection, and various expedientshave been adopted to construct a suitable device to receive and overcomethis endwise movement of the rotary shaft carrying the grinding-disk.

Thirdly. In the peculiar construction ofsaid disk and in the generalarrangement and disposition of the various operative parts, which willbe more fully hereinafter explained,

The drawings accompanying this specification represent, in Figure 1, avertical central longitudinal section of a paper-pulp-fimshmg engineembodying my improvements, while Fig. 2 is an end view, and Fig. 3 aplan, of the same. Fig. 4 is a section of a portion of the grinding-disktransversely of the cutting-bars, 6c taken on line a: w of Fig. 5, whileFig. 5 s a top View, and Fig. 6 an enlarged GIOSS-SBOLIOD, of the rolland shaft.

In the drawings, A represents a rectangular frame resting upon suitablestandardaa 6 5 a. This frame supports a rotary shalt, 3, upon which issecured a grinding-plate or circular disk, 0, the latter being providedon both sides with a series of cutting bars or knives, b b, &c.,radially disposed thereof. These bars are adapted to engage andco-opcrate with opposite but similarly-d1sposed bars 0 c c c, securedwithin two circular sta tionary disks or bed-plates, D D. These lastare, moreover, securely bolted to the end heads, E E, adjustable endwiseupon the shaft B, and are adapted to enter and closely ntthe centralcircular shell, F, the whole forming a tight hollow casing, G, withinand through which the ground material is entered and dis charged.

It will be seen that the supply or inlet p'as sages d d connect with asettling-box, e, the latter being employed to receive and retain anysmall pieces of iron-scrap which mayhave 8 come from thebeating-engines. Moreover, it will be noticed that these passagesdeliver their contents centrally or thereabout of the rotary diskO,whenceit is discharged through an outlet, I, common toboth sides ofthegrind- 9o ing-disk,or to the spaces existing between the said diskand its cooperating bed-plates.

The construction of the latter parts D D 1s the same usuallyemployed-that is, they are composed of a series of steel bars radiallydisposed, which are retained in position by the usual wood filling. Forconvenience of repairs I have bolted them to end heads and adapted thelatter to enter the central shell,

F, tightly, but still capable of adjustment 10:) therewith. Thismovementof the end heads, E E, containing the bed-plates, is to provide means bywhich to regulate the space between the latter and the rotarygrinding-disk revolving between them. Thustheoperatoris enabled toreduce the stock passing through the engine more or less, as is desired.This adjust ment is effected by means of levers H H, pivoted at one endto the standards a a, while their opposite extremities are actuated byhand-screwsff,moving upon a screw-threaded rod, g, suitably mounted uponthe frame A. To maintain said heads in any fixed relative position withrespect to the grindingdisk,

these levers H H are furthermore pivotally attached to the hubs orextensions h h, exteriorly formed upon the adjustable heads E E. Thus itwill be understood that advance of the. hand-screws ff toward each otherwill cause the end heads, E E, and their bed-plates D D to approach thegrinding-disk, and thus diminish the space existing between the latterand the bedplates and cause the stock to be reduced more finely, whilethe reverse movements of said screws produce an opposite effect.

The peculiar construction of the rotary grinding disk requires specialdescription, and upon reference to Figs. 4 and 5, it will be seen thatthe bars b b are arranged radially of the shaft. Moreover, theirdimensions in width is equal to the width of the disk considered as anentirety, while their lower ends are provided with oppositely-disposedrectangular notchesz' i. In the making up of this disk or grinding plateupon its driving-shaft, I first provide a hub, j, formed with an annularrib, k, and with a sleeve, Z, of a bore sufficient to admit thedriving-shaft B. The bars are now placed in position with their innerends resting upon this sleeve, when the opposite corresponding hub, j,is slipped over the sleeve Z, the rib is engaging in the slots 13,

when the clamping nut m is turned home and the knives are in position.Wood filling a n, 820., is now driven in, and lastly, to prevent thethrusts and shocks incidental to the working of the engine fromloosening and displacing such flling, an iron band, 0, is shrunk uponthe circumference of the now completed disk 0.

The operation of the machine and the course and flow of the stocktherethrough is as follows: Thepulp discharged into the settling-vat eis there freed from any hard metallic substance liable to injure ordamage the rotary disk, whence it is conducted through the pipes d d andentered centrally but simultaneously upon oppositesides of thegrinding-disk. The latter, being in rapid rotation,at once seizes andconveys the stock quickly to its circumference, while in its passage itissubjected toinnumerable shearing blows or cuts from the grindingbars,and thus emerges in afinely-comminuted state and passes into thedischarge pipe F.

It will be readily understood how great are the advantages by makingboth sides of the grinding-disk equally active and efficient, and thiscan be accomplished only by feeding at the center and discharging at theperiphery of the revolving disk. Furthermore, by this system it will beseen that the thrusts consequent upon the grinding or work accomplishedon one side are balanced or counteracted by the work upon the oppositebut corresponding face of the rotary disk, and hence no step isrequired, which instrumentality has been hitherto such a seriousobjection in engines of this description.

A second and great advantage is that the stock is advanced by thecentrifugal force, and hence is always impelled with and not against it;hence there are no counter or opposing agencies or currents, and thetlow of the material is being expedited continually the more rapidly theengine is driven.

I am well aware that engines of this class have been constructed-such asthe well-known Kinsland engine-4n which a rotary grindingdisk laterallyarmed with knife-bars has been employed in connection with twooppositelydisposed stationary bed-plates; but in this machine the inletand discharge feed-pipes were both centrally disposed; hence the back ordischarge side of the engine was practically inoperative, since the pulpwas being forced against the centrifugal tendency to retard and maintainit upon-the circumference of the rotary disk. So, it was found that thefeed was very sluggish, and the stock had to be forced through underpressure, while the work on the front side was greater and the pressuregreater than upon the rear side; hence uneven wear and a step wasrequired.

I do not desire to be limited to theprecise form and construction ofparts constituting the engine as herein shown, since various alternativedevices maybe substituted therefor with out departing from the spirit ofmy inventionas, for instance, in lieu of adjusting the bedplates withthe screw-threaded rod and theleployed with equally good results.

I claim- 1. A pulp-finishing engine, constructed substantially asdescribed, in which the material to be ground is entered centrally uponeach side of thegrinding-disk and discharged atthe circumference of thelatter.

tion, with a circular grinding-disk furnished with cutting-bars on eachface, of the stationary but adjustable bed-plates co-perating therewith,and the inlet-supply pipes which enter centrally upon each side of saiddisk, substantially as and for purposes set forth.

3. The method herein described for feeding paper-pulp engines of theclass mentioned, whereby the stock is admitted centrally upon each sideof the rotary disk, to eliminate the end-thrusts and balance said disk,and thence discharged at the circumference by and in unison with thecentrifugal force incident to the rotations of said grinding-disk,substantially as described.

4.. In combination with the fixed shell F, convers, as shown, a rack andpinion may be em-' 2. In a pulp-finishing engine, the con1bina- 6. Acircular grinding-disk composed of a series of knives radially disposedand of a 1 width equal to the thickness of the disk to which they aresecured, whereby the opposite edges of each bar shall constitute anactive cutting-surface, substantially as stated.

In testimony whereof I aftix my signature in 20 presence of twowitnesses.

SIMEON LATHAM GOULD. Witnesses:

H. E. LODGE, F. CURTIS.

